Method for monitoring the heating of coke ovens in relation to a pushing sequence



. H. SCHUROFF METHOD FOR MONITORING THE HEATING OF COKE OVENS INRELATION TO A PUSHING SEQUENCE Filed July 39., 1968 RELAY v 3% 2H F j 94 r 60 MIA/07E [AL/48M Pl/SHEE Mame MAX/MUM weeavr RELAY! 5 l p {40M/Nl/TE ALARM awe/Q2 H5475? 4, s/wr-aow/v mvagyToR,

f/E/NE/C/l Stf/flR'I/OFF United States Patent 3,491,356 METHOD FORMONITORING THE HEATING OF COKE OVENS IN RELATION TO A PUSHING SEQUENCEHeinrich Schiirhoff, Essen, Germany, assignor, by mesne assignments, toKoppers Company, Inc Pittsburgh, Pa., a corporation of Delaware FiledJuly 30, 1968, Ser. No. 748,664 Claims priority, application Germany,Aug. 2, 1967,

1,671,324 I Int. Cl. G05b 9/01 US. Cl. 340-419 3 Claims ABSTRACT OF THEDISCLOSURE According to the invention, the pushing sequence of thepusher machine is determined by themaximum current input and when thisis compared with the stipulated oven schedule, time relays areactivated, after the expiration of preselected time intervals, that shutoff the supply of heat to the coke oven battery.

BACKGROUND OF THE INVENTION The object of the invention is a process forsupervising the heating of by-product coke ovens.

In the operation of by-product coke ovens it is indispensable tomaintain the oven schedule, by which the sequence and time interval ofthe pushing of coke are stipulated. This is especially true whenoperating the coke ovens at short working periods with high heatingfluetemperatures, which can amount to about 1600 C. A delay of the pushingsequence would lead to overheating inside the heating flues at thesetemperatures, and the refractory oven masonry would soon be destroyedthereby. In addition, it is also necessary to avoid an overheating ofcoke charges that are completely coked when a delay occurs.

The object of the invention, therefore, is to provide a process whichmakes it possible reliably to avoid such overheatings as a result ofdeviations of the oven schedule.

SUMMARY OF THE INVENTION The method of the invention comprisesdetermining the pushing sequence of a pushing machine associated withthe coke oven battery and determining the maximum current input to thepushing machine motors. Then, activating time relays, set to a certainpreselected time interval, throttle or shut down the heat supply to thecoke oven battery.

BRIEF DESCRIPTION OF THE DRAWING The drawing illustrates schematicallyequipment suitable for carrying into practice the method of theinvention.

DETAILED DESCRIPTION According to the invention, it is suggested thatthe pushing sequence of the pusher machine be determined by its currentinput and compared with the stipulated oven schedule, and that thedelays of the pushing sequence, determined in this manner, be used asimpulse for throttling or interrupting the supply of heat.

Suitable instruments for measuring and recording the current input inthe particular pushing of the coke charge, and consequenty,simultaneously for determining the pushing sequence, i.e., the timeinterval between individual pushing operations, are suitably installedon a central control panel, and are coupled with the control for supplyof heat. This coupling can be effected in various manners. In thedrawing, one embodiment of a control installation is schematicallyrepresented.

A maximum contactor 1 is in the ammeter for the pusher ram drivemechanism. When coke is being pushed, the current to the pusher ramdrive motors increases to a maximum and the maximum contactor closes.The closing of the maximum contactor 1 activates relay 2. Thisactivation, in turn, activates relays 3 and 4.

Now, if the pushing sequence of the coke oven battery is 30 minutes, forexample, then the time relay 3, in case the next oven has not yet beenpushed, at the end of 40 minutes, sends an impulse to the alarm 5 whichoptically and/or acoustically announces the absence of a push accordingto schedule.

If the next push has not occurred, for example, after another 20 minutedelay, then the time relay 4 activates the alarm 6 which, in turn,activates the alternating blast shifting arrangement 7 in such a waythat the heating is throttled or rather is shut down.

According to a preferred modification of the invention, it is possible,in case of a delay of the pushing sequence, first to effect, via a timerelay an optical or acoustic prewarning calling, for a throttling of thesupply of heat and, in case of a longer interruption, for automaticallyshutting olf the supply of heat.

The time after which the prewaming occurs can be selected, for example,at 40 minutes. If operation of the pusher machine is still interruptedafter minutes in all, heating is stopped by first closing the gas valvesand then centrally throttling the draft to about 4 mm. water gage in theelbows. The operating condition is then safe.

After shutting off the supply of heat, the decision as to when theheating of the coke oven can be resumed is dependent on the type andextent of the breakdown, which led to the interruption of the supply ofheat, and it must be made by superintending personnel.

With the process according to the invention, care is taken in a reliablemanner that damages to the oven masonry as a result of overheating areno longer possible in case of the occurrence of any type of breakdownsor interruptions in the sequence of operations of a group of coke ovens.These damages are expensive to repair and they also result in aconsiderable loss of production.

Although the invention has been described herein with a certain degreeof particularity, it is understood that the present disclosure has beenmade only as an example and that the scope of the invention is definedby what is hereinafter claimed.

What is claimed is:

1. Method for monitoring the heating of a coke oven battery comprisingthe steps:

(a) determining the pushing sequence of a pushing machine associatedwith said battery;

(b) determining the maximum electrical current input to the drive motorsof said pushing machine ram and activating 'a time delay relay inresponse to the maximum current input to energize a relay adapted tooperate an alarm after a preselected time interval;

(c) utilizing time delays in pushing after elapse of a preselected timeinterval to activate apparatus adapted to shut down the supply of heatto said coke oven battery.

2. The invention of claim 1 including the step:

(a) effecting a Warning signal after the elapse of said preselected timeinterval.

3. The invention of claim 1 including the step:

(a) activating a second time relay after a second preselected timeinterval subsequent to the expiration of said first time interval; and

('b) shutting down the supply of heat to said coke oven battery upon theexpiration of said second preselected time interval.

References Cited UNITED STATES PATENTS Dyksterhuis 340-209 Wilson 110101Gilbert 21423 Weber et a1 340222 NORMAN YUDKOFF, Primary Examiner D.EDWARDS, Assistant Examiner s. 01. X.R. 340-309.6, 253; 201-1; 202262

